Abstract
A study of seven pairs of monozygotic twins, identified by at least one member of each set wearing concave lenses, shows all to be concordant for near‐sightedness. A survey of the world literature reveals a total of 106 monozygotic twin pairs with myopia, 100 of them reported to be concordant for the disorder. In contrast, 41 dizygotic pairs with myopia are identified, and of these only 12 are concordant. The results of the present study are consistent with a genetic mode of transmission.

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